Improvement in molding chilled-iron projectiles



UNITED STATES PATENT OFFICE..

IVILLIAM BOEKEL, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN MOLDIING CHlLL'ED-IRON PROJECTILES.

tspecilication forming part of' Letters Patent No. 37,272, dared January (5,1863.

To all whom, t '12m/.lj concern:

Be it known that I, YVILLTAM BonKEL, of the city ot' Philadelphia and State ot' Pennsylvania, have invented a new and Improved Mode of Molding Chilled-Iron Projectiles; and I do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, and to the figures and letters of reference marked thereon.

The object of my invention is to provide an expeditious and reliable means of preparing sand molds, to be used n connection with metal chills for casting chilled-iron projectiles, which, owing to their increased hardness over those of ordinary cast-iron, possess greater penetratve power, and can be manufactured at far less cost than wrought-iron or steel projectiles.

The nature of my invention consists in thev employment of peculiar' devices in the operation of preparing` the said sand molds, by means et' which these molds can be produced very rapidly and in a manner giving more accurate and sound casting than usually obtained with the ordinary handmolding process.

The main feature of my invention consists in the application of a pair of molding-irons, between which the flask is placed and conlined while undergoing the operation of ramming,77 and which, by means of various appendages, produce in the most perfect manner the required impressions and tubular channels in the sand, for pouring the metal and for carrying oft' the heated air from the interior o1l the mold. These sand molds may be used in connection with iron chills containing the molds for any convenient number of projectiles, varying with the size of the latter.

In order that my said invention may be fully understood, I will now proceed more particularly to describe the same, reference being had to the accompanying drawings, and to the figures and letters of reference marked thereon, and in which- Figure 1 represents in section a, chill for an elongated projectile with the sand flask attached complete for pouring in the melted metal. Fig. 2 is a plan of the chill. Fig. 3 is a sectional view of the sand flask conned between the top and bottom molding-plates and undergoing the operation of molding. Fig. 4 is a plan ot' the completed sand mold detached `from the molding-irons. Fig. 5 is a detached view ofthe top molding-iron. Fig. 6 represents a modification of Fig. 3 applied to a different form of chill and projectile. Fig. 7 represents the sand mold of Fig. 6 attached to its chill, ready for casting. Fig. 8 is a lower moldingiron and portion of a sand mold for a pro- ]'ectile varying in its amount of chilled surface from the above. Fig. Qrepresents a complete inold and chill for casting a spherical projectile.`

The chill represented in Fig. l produces an elongated shot, in which the chilling effect is extended over its entire length, only the blunt end being brought in Contact with the sand. The chill is in this instance formed of a main bottom piece, A, recessed at the top to receive a ring, b, composed of four segments, over which is placed the upper chill, C. By means of the ring b an annular groove is formed in the projectile, serving as a means of securely attaching the expansive metal cup, which is afterwards provided. It will be obvious that the ring must be made in segments, to permit its detachment from the casting.

I) is the sand flask resting on the chill C, the two chills and the fiask' D being further attached to each other and accurately confined to their respective positions by the dowel-pins e c e, the holes for which are drilled through lugs fj', provided in the three pieces.

g is the gate formed in the sand for receiving the melted iron, and h is one ot' the vents77 for carrying olf the air when the chill is filling with metal.

The manner of preparing the sand mold (see Fig. 3) is as follows: An empty flask, D, is placed upon a circular plate, E, which constitutes the lower molding-iron, and is provided with dowel-pins c', coinciding in size and position with the pins c in the chill. The upper molding-iron, F, is next placed upon the top of D, with its downward-projecting dowelpins e2 resting in the holes provided in the flask. This upper molding-iron, F, consists of a central part, i, from which extend three arms, j j j, provided at their outer ends with the pins ci. At the lower side of 'i is attached a projection, k, the impression of which in the sand forms the enlarged mouth of the gate. The gate itself is formed by means ot' ver- Y reduced to a sharp edge, allowing no sand to tical pin, Z, inserted through a hole in the eenter of fr', and passing through the projection 7c, as seen at Fig. 3.

m m are the vent-wires, passing in an inclined direction through holes provided in the arms j. The conically-shaped points of these wires and ofthe gate-pin Z extend partly into openings provided for this purpose in the bottom plate, E. These openings are made conical in the opposite direction to the conical points entering from above, so that the surface of contact of the pins with the plate is lodge in the plate below the surface. Vhen F is placed upon the flask and the gate-pin and vent-wires inserted, as described, the flask D is filled with sand through the open spaces remaining between the arms jj j, and when the sand has been compressed to the required density by means ot' the ordinary molders tools and leveled upon the top the pin Z and wires m m are withdrawn. The top moldingiron, F, is next lifted and removed, whereupon the asl itself, being thus completed, is l taken -from the bottom molding-plate and i placed upon its chill, as seen at Fig. l.

In Fig. 7 is represented a chill composed only of the lower part, A, and ring b, the portion of the projectile extending above the latter being molded in the sand. To this end the mold-plate E, Fig; 6, is provided with the up- Vward projection a, to produce the required 1. rlhe described mode of molding chillediron projectiles, when the sand mold employed, in combination with a chill for any convenient number of castings, is formed by means of the molding-irons E and F and their appendages substantially in the manner and for the pun pose set forth.

2. The employment ot' the ring b, or its equivalent, in combination with the main body of the chill, for the purpose described.

WILLIAM BOEKEL.

lVitnesses: i

LoUIs ZENNEGG, TnEoDoRE BERG-Nan. 

